Low-Pore Pellets and Method for Producing Molded Body

Patent metadata

Field	Value
Publication number	US-2022203585-A1
Application number	US-202017610886-A
Country	US
Kind code	A1
Filing date	May 13, 2020
Priority date	May 13, 2019
Publication date	Jun 30, 2022
Grant date	—

Abstract

Provided are a pellet including a thermoplastic resin and cellulose nanofibers that enables the production of a molded body which has a good appearance in which yellowing is suppressed, and a method for producing a molded body using the same. According to one aspect, there is provided a pellet including a thermoplastic resin and cellulose nanofibers, wherein the number of pore-containing pellets per 100 pellets is 10 or less. Further, according to another aspect, there is provided a method for producing a molded body, which includes a step of preparing the pellets, and a step of injection molding the pellets in a mold to obtain a molded body.

First claim

1 : Pellets of a resin composition comprising a thermoplastic resin and cellulose nanofibers, wherein the number of void-containing pellets per 100 pellets is 10 or less, wherein the cellulose nanofibers are hydrophobized cellulose nanofibers.

2 : Pellets according to claim 1 , wherein the ratio of the void area with respect to the cross-sectional area of the pellet TD cross-section is 4.0% or lower.

3 : Pellets according to claim 1 , wherein the number of void-containing pellets per 100 pellets is 1 or less.

4 : Pellets according to claim 1 , wherein the angle formed by the normal to the cut surface of the pellets with respect to the MD direction of the pellets is 5° to 30°.

5 : Pellets according to claim 1 , wherein the short diameters of the TD cross-sections of the pellets are 2 mm to 5 mm.

6 : Pellets according to claim 1 , which comprise the cellulose nanofibers at 0.1 to 30 mass %.

7 : Pellets according to claim 1 , wherein the cellulose nanofibers have fiber diameters of 50 to 1000 nm and a fiber length/fiber diameter (L/D) ratio of 30 or greater.

8 . (canceled)

9 : Pellets according to claim 1 , wherein the thermoplastic resin is a polyamide-based resin and/or polyolefin-based resin.

10 : Pellets according to claim 1 , which further comprise an elastomer.

11 : Pellets according to claim 1 , which further comprise cellulose nanocrystals having diameters of 100 nm or smaller and an L/D of less than 30, or cellulose microfibers with fiber diameters of greater than 1 μm and up to 50 μm, or a mixture of the same.

12 : Pellets according to claim 1 , wherein the difference Tcc−Tcp between the temperature decrease crystallization peak temperature Tcc of the resin composition measured with a differential scanning calorimeter and the temperature decrease crystallization peak temperature Tcp of the thermoplastic resin measured with a differential scanning calorimeter, is 5° C. to 30° C.

13 : Pellets according to claim 1 , wherein the ratio Ve/Vc of the total volume (Ve) of pellet voids and the total volume (Vc) of the cellulose nanofibers, per 100 pellets, is 0 vol % to 4 vol %.

14 : Pellets according to claim 1 , wherein:
the resin composition further comprises a resin crystallization temperature lowering agent, and the resin crystallization temperature lowering agent is a compound that lowers the temperature decrease crystallization peak temperature of the resin composition by 5 to 30° C. as measured with a differential scanning calorimeter.

15 : A method for producing a molded body, which comprises:
a step of preparing pellets according to claim 1 , and a step of injection molding the pellets in a mold to obtain a molded body.

Assignees

• Asahi Chemical Ind

Inventors

• Tanimoto Kazuhiro

Classifications

• C08K2201/003

  Additives being defined by their diameter · CPC title

• B29C48/05

  Filamentary, e.g. strands · CPC title

• B29B7/007

  for continuous mixing · CPC title

• B29B7/72

  Measuring, controlling or regulating · CPC title

• B29C45/0001 Primary

  characterised by the choice of material · CPC title